svn-gvsig-desktop / trunk / libraries / libGDBMS / src / com / hardcode / gdbms / engine / data / indexes / VariableDiskIndexSet.java @ 1956
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package com.hardcode.gdbms.engine.data.indexes; |
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import java.io.File; |
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import java.io.FileInputStream; |
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import java.io.FileOutputStream; |
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import java.io.IOException; |
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/**
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* Implementaci?n de VariableIndexSet que escribe los ?ndices en un fichero
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*
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* @author Fernando Gonz?lez Cort?s
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*/
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public class VariableDiskIndexSet extends DiskIndexSet |
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implements VariableIndexSet {
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private long count = 0; |
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/**
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* A?ade todos los ?ndices que se pasan como par?metro
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*
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* @param initialSet Conjunto de ?ndices que se quieren a?adir
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*
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* @throws IOException Si se produce un fallo al a?adir los ?ndices
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*/
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public void addAll(VariableIndexSet initialSet) throws IOException { |
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for (long i = 0; i < initialSet.getIndexCount(); i++) { |
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addIndex(initialSet.getIndex(i)); |
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} |
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count = initialSet.getIndexCount(); |
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} |
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/**
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* @see com.hardcode.gdbms.engine.data.indexes.VariableIndexSet#addIndex(long)
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*/
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public void addIndex(long index) throws IOException { |
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buffer.put((byte) (index >>> 56)); |
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buffer.put((byte) (index >>> 48)); |
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buffer.put((byte) (index >>> 40)); |
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buffer.put((byte) (index >>> 32)); |
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buffer.put((byte) (index >>> 24)); |
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buffer.put((byte) (index >>> 16)); |
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buffer.put((byte) (index >>> 8)); |
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buffer.put((byte) (index >>> 0)); |
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buffer.flip(); |
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outputChannel.write(buffer); |
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buffer.clear(); |
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count++; |
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} |
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/**
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* @see com.hardcode.gdbms.engine.data.indexes.VariableIndexSet#getIndex(long)
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*/
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public long getIndex(long nth) throws IOException { |
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buffer.clear(); |
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inputChannel.read(buffer, nth * 8);
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buffer.flip(); |
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return buffer.getLong();
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} |
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/**
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* @see com.hardcode.gdbms.engine.data.indexes.VariableIndexSet#getIndexCount()
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*/
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public long getIndexCount() { |
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return count;
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} |
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/**
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* @see com.hardcode.gdbms.engine.data.indexes.VariableIndexSet#open(java.io.File)
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*/
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public void open() throws IOException { |
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file = File.createTempFile("index", "idx"); |
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file.deleteOnExit(); |
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fos = new FileOutputStream(file); |
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outputChannel = fos.getChannel(); |
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} |
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/**
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* @see com.hardcode.gdbms.engine.data.indexes.VariableIndexSet#close()
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*/
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public void close() throws IOException { |
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inputChannel.close(); |
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fis.close(); |
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} |
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/**
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* @see com.hardcode.gdbms.engine.data.indexes.VariableIndexSet#indexSetComplete()
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*/
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public void indexSetComplete() throws IOException { |
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outputChannel.close(); |
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fos.close(); |
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fis = new FileInputStream(file); |
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inputChannel = fis.getChannel(); |
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} |
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/**
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* DOCUMENT ME!
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*
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* @return DOCUMENT ME!
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*
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* @throws IOException
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*
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* @see com.hardcode.gdbms.engine.data.indexes.VariableIndexSet#getIndexes()
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*/
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public long[] getIndexes() throws IOException { |
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long[] ret = new long[(int) getIndexCount()]; |
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for (int i = 0; i < ret.length; i++) { |
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ret[i] = getIndex(i); |
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} |
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return ret;
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} |
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} |